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He started his career at Club Deportivo Morón, playing in the Argentine second and third division. In 2002, having not played first division football, he was signed by Piacenza, who were in Serie A at the time.

On 9 July 2009 he was sold to Napoli for €7 million,[6] as part of the deal Daniele Mannini moved to Sampdoria in joint-ownership bid for €3.5 million;[7] he signed a 4-year contract.[8]

Campagnaro made his debut with Napoli on 23 August 2009 in week one of the 2009–10 Serie A season against Palermo, playing the entire match in a 2–1 away loss.[9] Later, in March 2010, he scored his first goal for Napoli after am assist by Ezequiel Lavezzi in a 1–1 draw against Milan at the San Siro.[10] He finished his first season with Napoli having played 30 matches, 28 of them in Serie A, with Napoli finished the league in 6th place and qualifying for the 2010–11 UEFA Europa League play-off round.

In 2010–11 season, he was one Napoli's most important players, helping the team to finish the season in 3rd place and qualifying directly to the group phase of the 2011–12 UEFA Champions League.[11] He played 39 matches in all competitions. He made his European debut with Napoli in second match of play-off round against swedish side Elfsborg, playing final 17 minutes in a 2–0 win at Borås Arena.[12]

In 2011–12 season, Campagnaro won his first trophy with Napoli, the Coppa Italia, where he played 90 minutes to help the team to a 2–0 win against Serie A champions Juventus at Stadio Olimpico.[13] On 14 September 2011, for the first time in his career, he made his Champions League debut on Matchday 1 against Manchester City, playing 90 minutes in a 1–1 draw at Etihad Stadium.[14] Napoli finished Group A in Champions League as runners-up with 11 points, with Bayern Munich topping the group. In the first leg of the round of 16 clash against English side Chelsea (who would go on to win the tournament), Campagnaro played 90 minutes for Napoli in an historic win 3–1 at the Stadio San Paolo [15] Napoli lost the second match 4–1 after extra time at Stamford Bridge and were eliminated from the tournament.

On 6 July 2013, Campagnaro signed for Internazionale on a two-year deal. He made his debut with Inter in third round of 2013–14 Coppa Italia, who Inter beat 4–0 Cittadella to pass the round.[20] He started the match and played 65 minutes alongside with Ranocchia and Juan Jesus. He debuted in Serie A on 25 August in week one of 2013–14 season against Genoa in a 2–0 win at San Siro.[21] He ended first season in the Nerazzurri shirt playing 23 matches in all competitions.

For the 2014–15 season, many rumours circulated regarding a possible departure from Inter, but the player refused to negotiate a cancellation of his contract and did not leave the club.[22] He made his European debut for Inter in the first match of the group stage of the 2014-15 Europa League against Ukrainian side Dnipro Dnipropetrovsk.[23]

On 9 June 2011, he was involved in a serious road traffic accident in the province of Córdoba, Argentina, which killed one of the passengers in his SUV and two people in the other car involved in the incident.